Adult cannot welcome what may be seen around ancient capital (7)
I believe the answer is:
acanthi
'may be seen around ancient capital' is the definition.
I can't tell whether this defines the answer.
'adult cannot welcome' is the wordplay.
'adult' becomes 'a' (abbreviation).
'cannot' becomes 'can't' (contraction).
'welcome' becomes 'hi' (both are greetings).
'a'+'cant'+'hi'='ACANTHI'
'what' is the link.
Can you help me to learn more?
(Other definitions for acanthi that I've seen before include "Prickly plants" , "bloomers" .)